270 lines
6.6 KiB
C
270 lines
6.6 KiB
C
/*
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* drivers/base/dma-mapping.c - arch-independent dma-mapping routines
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*
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* Copyright (c) 2006 SUSE Linux Products GmbH
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* Copyright (c) 2006 Tejun Heo <teheo@suse.de>
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/export.h>
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#include <linux/gfp.h>
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#include <asm-generic/dma-coherent.h>
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/*
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* Managed DMA API
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*/
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struct dma_devres {
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size_t size;
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void *vaddr;
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dma_addr_t dma_handle;
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};
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static void dmam_coherent_release(struct device *dev, void *res)
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{
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struct dma_devres *this = res;
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dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle);
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}
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static void dmam_noncoherent_release(struct device *dev, void *res)
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{
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struct dma_devres *this = res;
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dma_free_noncoherent(dev, this->size, this->vaddr, this->dma_handle);
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}
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static int dmam_match(struct device *dev, void *res, void *match_data)
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{
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struct dma_devres *this = res, *match = match_data;
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if (this->vaddr == match->vaddr) {
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WARN_ON(this->size != match->size ||
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this->dma_handle != match->dma_handle);
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return 1;
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}
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return 0;
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}
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/**
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* dmam_alloc_coherent - Managed dma_alloc_coherent()
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* @dev: Device to allocate coherent memory for
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* @size: Size of allocation
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* @dma_handle: Out argument for allocated DMA handle
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* @gfp: Allocation flags
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*
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* Managed dma_alloc_coherent(). Memory allocated using this function
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* will be automatically released on driver detach.
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*
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* RETURNS:
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* Pointer to allocated memory on success, NULL on failure.
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*/
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void * dmam_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp)
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{
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struct dma_devres *dr;
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void *vaddr;
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dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp);
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if (!dr)
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return NULL;
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vaddr = dma_alloc_coherent(dev, size, dma_handle, gfp);
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if (!vaddr) {
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devres_free(dr);
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return NULL;
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}
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dr->vaddr = vaddr;
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dr->dma_handle = *dma_handle;
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dr->size = size;
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devres_add(dev, dr);
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return vaddr;
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}
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EXPORT_SYMBOL(dmam_alloc_coherent);
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/**
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* dmam_free_coherent - Managed dma_free_coherent()
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* @dev: Device to free coherent memory for
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* @size: Size of allocation
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* @vaddr: Virtual address of the memory to free
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* @dma_handle: DMA handle of the memory to free
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*
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* Managed dma_free_coherent().
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*/
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void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle)
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{
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struct dma_devres match_data = { size, vaddr, dma_handle };
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dma_free_coherent(dev, size, vaddr, dma_handle);
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WARN_ON(devres_destroy(dev, dmam_coherent_release, dmam_match,
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&match_data));
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}
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EXPORT_SYMBOL(dmam_free_coherent);
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/**
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* dmam_alloc_non_coherent - Managed dma_alloc_non_coherent()
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* @dev: Device to allocate non_coherent memory for
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* @size: Size of allocation
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* @dma_handle: Out argument for allocated DMA handle
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* @gfp: Allocation flags
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*
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* Managed dma_alloc_non_coherent(). Memory allocated using this
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* function will be automatically released on driver detach.
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*
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* RETURNS:
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* Pointer to allocated memory on success, NULL on failure.
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*/
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void *dmam_alloc_noncoherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp)
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{
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struct dma_devres *dr;
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void *vaddr;
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dr = devres_alloc(dmam_noncoherent_release, sizeof(*dr), gfp);
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if (!dr)
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return NULL;
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vaddr = dma_alloc_noncoherent(dev, size, dma_handle, gfp);
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if (!vaddr) {
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devres_free(dr);
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return NULL;
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}
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dr->vaddr = vaddr;
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dr->dma_handle = *dma_handle;
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dr->size = size;
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devres_add(dev, dr);
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return vaddr;
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}
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EXPORT_SYMBOL(dmam_alloc_noncoherent);
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/**
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* dmam_free_coherent - Managed dma_free_noncoherent()
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* @dev: Device to free noncoherent memory for
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* @size: Size of allocation
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* @vaddr: Virtual address of the memory to free
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* @dma_handle: DMA handle of the memory to free
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*
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* Managed dma_free_noncoherent().
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*/
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void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle)
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{
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struct dma_devres match_data = { size, vaddr, dma_handle };
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dma_free_noncoherent(dev, size, vaddr, dma_handle);
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WARN_ON(!devres_destroy(dev, dmam_noncoherent_release, dmam_match,
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&match_data));
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}
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EXPORT_SYMBOL(dmam_free_noncoherent);
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#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
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static void dmam_coherent_decl_release(struct device *dev, void *res)
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{
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dma_release_declared_memory(dev);
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}
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/**
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* dmam_declare_coherent_memory - Managed dma_declare_coherent_memory()
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* @dev: Device to declare coherent memory for
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* @bus_addr: Bus address of coherent memory to be declared
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* @device_addr: Device address of coherent memory to be declared
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* @size: Size of coherent memory to be declared
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* @flags: Flags
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*
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* Managed dma_declare_coherent_memory().
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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*/
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int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
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dma_addr_t device_addr, size_t size, int flags)
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{
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void *res;
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int rc;
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res = devres_alloc(dmam_coherent_decl_release, 0, GFP_KERNEL);
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if (!res)
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return -ENOMEM;
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rc = dma_declare_coherent_memory(dev, bus_addr, device_addr, size,
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flags);
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if (rc == 0)
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devres_add(dev, res);
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else
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devres_free(res);
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return rc;
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}
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EXPORT_SYMBOL(dmam_declare_coherent_memory);
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/**
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* dmam_release_declared_memory - Managed dma_release_declared_memory().
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* @dev: Device to release declared coherent memory for
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*
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* Managed dmam_release_declared_memory().
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*/
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void dmam_release_declared_memory(struct device *dev)
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{
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WARN_ON(devres_destroy(dev, dmam_coherent_decl_release, NULL, NULL));
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}
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EXPORT_SYMBOL(dmam_release_declared_memory);
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#endif
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/*
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* Create scatter-list for the already allocated DMA buffer.
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*/
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int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
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void *cpu_addr, dma_addr_t handle, size_t size)
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{
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struct page *page = virt_to_page(cpu_addr);
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int ret;
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ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
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if (unlikely(ret))
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return ret;
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sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
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return 0;
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}
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EXPORT_SYMBOL(dma_common_get_sgtable);
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/*
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* Create userspace mapping for the DMA-coherent memory.
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*/
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int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t dma_addr, size_t size)
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{
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int ret = -ENXIO;
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#ifdef CONFIG_MMU
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unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
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unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
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unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr));
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unsigned long off = vma->vm_pgoff;
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
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return ret;
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if (off < count && user_count <= (count - off)) {
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ret = remap_pfn_range(vma, vma->vm_start,
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pfn + off,
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user_count << PAGE_SHIFT,
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vma->vm_page_prot);
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}
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#endif /* CONFIG_MMU */
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return ret;
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}
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EXPORT_SYMBOL(dma_common_mmap);
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